Dynamo-electric machine.



No. 894,950. v PATENTED AUG. 4, 1908. W. T. HENSLEY. DYNAMO ELECTRICMAGHINE.

APPLICATION FILED OOT.18, 1907.

Big. 5.

WITNESSES: Q

UNITED STATES PATENT oEEIoE.

WILLIAM T. I-IENSLEY, OF WILKINSBURG, PENNSYLVANIA, ASSIGNOR TOWESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION OFPENNSYLVANIA. I

DYNAMO-E LE C'IRIC MACHINE No. 894,950. Specification of Letters Patent.

Patented Aug. 4, 1908. Application filed October 18, 1907. Serial No.398,034.

To all whom it may concern:

Be it known that I, WILLIAM T. HENsLEY, a citizen of the United States,and a resident of Wilkinsburg, in the county of Allegheny and State ofPennsylvania, have invented a new and useful Improvement in Dynamo-Electric Machines, of which the following is a specification.

My invention relates to dynamo-electric machines, and it has for itsobject to provide improved means for securing necks or connecting stripsto commutator bars.

In dynamo-electric machines, the outside diameter of the commutatorcylinder is usually considerably less than that of the armature corewith which it is associated. Consequently, it is necessary to provideadequate means for establishing electrical connections between theextremities of the armature coils and the commutator bars, and it isspecially desirable that these connections shall be mechanically rigidand durable.

My invention is illustrated in the accompanying drawings, in whichFigure 1 is a side elevation, partially in 'sectlon, of a supportingstructure and a single commutator bar to which a neck or connectingstrip is secured, in accordance with my invention. Figs. 2, 3, and 4 aredetail views of the bar and necks of Fig. 1 and Fig. 5 is a plan viewshowing the arrangement of two bars assembled to receive the necessarymachining which adapts them for connection to the neck or connectingstrip.

Referring to the drawings, commutator bars 1 and 2 are assembled asshown in Fig. 5 and are then machined to produce an annular recess orgroove 3 which is equally divided between the two bars and forms aprojection 4 of semi-circular section. The recesses or grooves 3 are soformed that, when the bars are assembled, their grooved portions arelocated near their inner ends and on corresponding sides. A commutatorneck or commutator strip 5 of any suitable length is provided with alooped extremity 6 produced by rounding the end of the strip and forminga small semi-circular hole 7 which is near to, and concentric with, therounded end. The radii of the hole 7 and the end of the stripcorrespond, respectively, to those groove provided in the latter, and amore 0percte of the inner and outer edges of the semiannular groove withwhich the commutator bar is provided, and the depth of this groove ismade equal to the thickness of the strip.

The neck or strip 5 may be suitably formed by a simple punching process,and a hollow milling cutter may be advantageously used for making theslot or groove 3 in two bars at once, consequently, the amount of laborand expense involved is relatively small.

In securing a strip to a bar, the looped end of the former is fittedinto the semi-annular fect electrical connection may be effe bysoldering the two parts together.

The center line of the neck or strip 5 may or may not be perpendicularto the contact surface of the bar to which it is secured, this anglebeing adapted to the machine with which the commutator is used and beingde termined by the angle existing between the flat side of thesemi-circular hole 7 and the center line of the neck.

The semircircular shape of the projection 4 serves to prevent relativemovement be tween the two parts, and the width of the neck 5 ispreferably made substantially equal to the outside diameter of thegroove 3, but this is not essential.

It is conceivable that various modifications in the size and arrangementof parts may be effected within the scope of my invention, and I desirethat only such limitations be imposed as are indicated in the appendedclaims.

I claim as my invention:

1. The combination with a commutator bar having a semi-annular groove onone side near its inner end, of a neck or strip having a loopedextremity that engages said groove.

2. The combination with a commutator bar having a semi-annular groove011 one side near its inner end that terminates in the con tact edge ofthe bar, of a neck or strip having a looped extremity that engages thegroove.

3. The combination with a commutator bar having a semi-annular groove onone side near its inner end that terminates in the contact edge of thebar and forms a semi-circular projection, of a concentric neck or striphaving a looped extremity that fits over the projection and into thegroove.

4:. The combination with a colnniutatorl In testimony whereof, I havehereunto bar having a groove on one side near its inner i subscribed myname this 8th day of October, end that terminates in the contact edge oft 1907. the bar and forms a projection, of a connect- \VLLIJIAM '1. HENSLEY. ing strip or neck having a looped extremity \Nitnesses: thatfits over the projection and into the 'l. P.i\l0DER1\I10TT,Jr., groove.1 BIRNEY HrNEs.

